At last week's Tidal X:1020 event at Brooklyn's Barclays Center, Beyoncé and Nicki Minaj stopped the world when they shared the stage for the first-ever live performance of their hit collaboration, "Feeling Myself." But it appears that Bey and Nicki are feeling a lot more than just themselves. They're feeling each other pretty hard right now, too. The latest chapter in a friendship that has already given us, this, this, and this, comes in the form of a behind-the-scenes video of their rehearsal for the mega-concert. But the real takeaway here is Beyoncé's cover of Prince's classic song "Darling Nikki," which she reimagines into a charming ode to her new BFF. Watch and listen, above.